Hardest lane is by far bot lane, simply because you have to depend on each other to win it which usually doesn't go so well.
As for tips everything is pretty straight forward assuming you're actually using runes/masteries
depending on preference (most people start with their bot lane) do krugs or gromp then do your buff, some people like to do raptors/wolves then buff. After one side is clear typically you go for scuttle since the first one is really weak and and easy to get.
After that do your other side (depending on hp/mana) you either go b or start ganking. If you go b you should be ganking straight after. If the lanes are pushed and you see the enemy jungler in a lane go to either counter gank or the opposite side and steal the jungle. A big mistake people do (I honestly don't know why) is they'll take all of the normal camps but when it comes to red/blue they will leave one small one. This is a backwards strategy.
When you counter. You leave 1 small raptor,wolf,krug etc. when you take a buff you take everything get YOUR TEAM the timer on it not let the enemy team get it.
When it comes for ganking depending on your champ sometimes you want to let your team know if they should go in or shouldn't. As a Shaco main I prefer when people behave casually so I can set up otherwise it just gives me away and makes my ganking shit.
For someone like, say amumu. You want them to engage, blow all their spells so when amumu comes they're fucked no matter what.
When it comes to dragon/baron DO NOT attempt to do so when you have NO SMITE. The ONLY time this is allowed is when you're 100% positive nobody is in the area/global ult to steal it. I hate when my jungler calls drag and have no smite then it gets stolen cause the enemy jungler came in and smited it. Also ALWAYS prep up before attempting drag (unless it's an ace ofc) ward the area around it as to not get caught off guard. Doing dragon or baron blind can fuck your team royally.
That's pretty much the basics of jungling. Any more is up to your playstyle and champ